Heat transfer device



June 9, 1931. 5 JACOBUS 1,809,240

HEAT TRANSFER DEVI CE Original Filed Sept. 4, 1918 3 Sheets-Sheet 1 INVENTOR ATTORNEYS.

June 9, 1931.

D. S. JACOBUS HEAT TRANSFER DEVICE Original Filed Sept. 4. 1918 3 Sheets-Sheet 2 INVENTOR wfl WITORNEYi 7% June 9, 1931. 5 Acoaus r 1,809,240

HEAT TRANSFER DEVICE Original Filed Sept. 4, 1918 3 Sheets-Sheet 5 IIJ'IIIIII I q I I I I I I 5 I I a I I I I I C I I I l I I I I I I I I I I 5 I I I I I I I I I I I I I I l I I I I I I I I I I I I I I' I I I I I I I I I I I I I I l l I l I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I l I I I I I I I I I I I I I I I l I I I I I I I I I I I I I I I I l I I I I I I I I I I I I I I I I I I I I I I I I I I l I I I I I I I I I I I I I I I I I I I I I I I I I I l I I I I I I I l I I I I I I I I I I I I I I I I I l I I I I I I l I I I I I l I I I I I I I l I I I I I I I I I I I I I I l I I l I I I I I I I I I I I I I l I I I I I I I I I I l I I I I I I I I I I I I I r I I I I I I I I I .I I I I I I II- I I I I I I I I I I I I x I I I I x v I l l v I I I I {L I \I l I Z I INVENTOR Patented June 9, 1931 DAV-ID S. JACOBUS, OF IHONTCLAIBJ, NEW JERSEY, ASSIGNOR TO THE BABCCCK & WILCOX COMPANY, OF BAYONNE,-NE\V JEBSEY, A CORPORATION OFNEW JERSEY HEAT TRANSFER- DEVICE Original application filed September 4, 1918, Serial Ive/252,550. Divided 'and'this application filed June 22,

This application'is adivision of my c0- pending case, Serial No252,550, filedSeptem transfer device, and'will' be best understood from the following description and the accompanying drawings; in which I have shown a selected embodiment of the invention and in which;

Fig. 1 is a vertical sectional view of an economizer and portions of a boiler, showing my invention applied to the economizer.

Fig. 2 is a transverse section through the economizer shown in Fig. 1.

Fig. 3 is a detaile'd view showing fragmen tary portions of headers and tubes arranged according to the invention, and taken on the line 3-3 of Fig. 4.

Fig. 4 is a View taken on the line lof F ig. 3.

Referring now to the drawings, I have illustrated the invention as applied to an economizer, here shown as disposed above a boiler, the drum of Which is shown at 1. The hotgases after passing over the heat absorbing surfaces of the boiler pass through a flue 2 to an economizer 3, from whichthey are dis' charged by a fan 4 into a flue 5.

The invention is shown as used in connection with a double boiler, which has "a second steam and waterdrum 1 from which'the hot gases flow upwardly to a flue 2, and are discharged through a second economizer disposed back of the economizer 3', and finally pass out of a'flue fi'. The heat transferdevice exemplified by the economizer, comprises a plurality of sections arranofed sitleby side; Each of these sections is shown as having a pair of headers 6 disposed substantially parallel to each other, and on the opposite sides of the gaspass through the economizer.

In the form shown, the headers aredisposedparallel to the direction of flow of the gases.

Connecting the'headers of each pair is aplurality of tubes 7 which, as plainly shown in Fig. 2, form a continuous bank across the gas pass. In this bank it will be seen that the tubesare substantially uniformly spaced.

Serial through "its circumteren'c'e.

The headers 6 are shown spaced apart, thus decreasing the Weight of metal required for headers, and this spacing may be of an amount suilicient to provide for the' removalof tubes, as plainly shown in Figs; 3 and 4. In these views the headers are shown'as spaced apart a distance greater than atube diameter, so

that individual tubes indicator at 7, may be a removed between the headers.

Referring more particularly to Figs. 3 and 4, it will be seen that each header is cylindrical in form, and that the nest of tubes in each section is wider than the two headers in that section. Preferably, the arrangement is similar to What is shown in Fig. 4, Whereby the spacing of tubes transversely oi the headers is substantially'uniform'across the bank of tubesfornied by the plurality of sections. The tubes in each nest are substantially parallel to eachother through the greater portion of their lengths, and are spaced closely together, the spacing'shown being less than a tube diameter; -Certain tubes are bent'at theirendsto enter holes i the and 4, each header is preferably"seamless and kn w has a Wall of substantially uniform t'hi The thin of the wall is preferably greaterthan that which is required tor strength to resist the pressure within-the"header, and this addi tional thickness'is used to advantage" at the) "tub'e'seat's. In Fig. 4, it will be seen that-the end of eachtube is directed toward a handhole 8. "This arrangement is highlg desir able in order'to provide ready insertion of cleaning or other tools into thetubes'. More 1 ready access may thus be obtained to the tubestha n-wotrld be possible if tlie tub'es'were disposed radially with respect to the headers.

Certain tubes do not need to be bent at their ends to any substantial extent, while others must be bent to a greater extent. The end of each tube is normally at right angles to its length and shouid have a seat whose end is substantially normal to the axis of the tube at that end. To obtain this seat for the bent 6110.3, I preferably cut away metal from the inner surface of the headers at the tubeholes, so as to form counterbores 10 which are substantially coaxial with the tube holes, so that the ends of the tubes which are received within the counterbores may be belied.

In the form shown, the tubes are arranged in pairs of sets, each set being secured in holes disposed in a band, extending circumferentially of the header to which the tubes are connected, and each handhole is arranged to give access to all the tubes in a pair of rows. It is to be understood, however, that I do not intend to limit myself to this arrangement. For example, the rows of tubes may be uniformly spaced lengthwise of the headers, and the handholes so arranged as to give access thereto.

The headers are arranged in groups, as shown in Fig. 1, with the headers at each end of each group connected to water compartments 11, and the compartments of adjacent groups being connected by pipes 12. The headers are connected at their end por tions to the water compartments by suitable pipes 13, these pipes in the present in stance taking the form of nipples. Water is supplied to the economizer at an inlet 14, and is discharged therefrom at an outlet 15.

I claim 1. In a heat transfer device, a plurality of sections arranged side by side, each section having a pair of headers with cylindrical walls provided with sets of holes each arranged in a circumferentially extending band tubes secured in said holes and connectlng the two headers of each pair, at least some of said tubes being bent at their ends to enter said holes, the headers of adjacent sections being spaced apart and the tubes of the sections forming a bank, the tubes in the bank being spaced substantially uniformly across the bank in a direction transverse to the length of the headers, a compartment common to a group of headers at each end of the sections. and pipes connecting the end portions of said headers to said compartment.

2. In a heat transfer device, a plurality of sections arranged side by side, each section having a pair of headers with cylindrical walls provided with sets of holes each arranged in a circumferentially extending band,

tubes secured in said holes and connecting the two headers of each pair, at least some of said tubes being bent at their ends to enter said holes, the headers of adjacent sections being spaced apart a distance greater than a tube diameter and the tubes of the sections forming a bank, the tubes in the bank being spaced apart a distance less than a tube diameter in a direction transverse to the length of the headers, a compartment common to a group of headers at each end of the sections, and pipes connecting the end portions of said headers to said compartment.

3. In a heat transfer device, a plurality of sections arranged side by side, each section having a pair of headers with cylindrical walls provided with sets of holes each arranged in a circumferentially extending band, tubes secured in said holes and connecting the two headers of each pair, at least some of said tubes being bent at their ends to enter said holes, the headers of adjacent sections being spaced apart and the tubes of the sections forming a bank, the tubes in the bank being spaced apart a distance less than a tube diameter in a direction transverse to the length of the headers, a compartment common to a group of headers at one end of the sections, and pipes connecting the end portions of said headers to said compartment.

4. In a heat transfer device, a cylindrical header having a wall of substantially uniform thickness throughout its circumference, said thickness being greater than is required for strength, and a nest of tubes entering holes in one side of the header, the ends of the tubes being directed toward a handhole formed in the side of the header opposite the tubes, and the metal of the header wall being cut away adjacent certain of said tube ends to provide counterbores substantially coaxial with the tube holes.

5. In a heat transfer device, a plurality of sections arranged side by side, each section having a pair of substantially cylindrical headers joined by a plurality of tubes, said tubes being received in a set of holes arranged in a circumferential band in the cylindrical wall of each header, at least some of said tubes being bent at their ends to enter the holes in the cylindrical walls, the headers at each end of the sections having a series of longitudinally disposed openings giving access to the tubes, closures therefor, a water compartment common to a group of headers at each end of the sections. and pipes connecting the end portions of said headers to said water compartment.

6. In a heat transfer device, a plurality of sections arranged side by side, each section having a pair of substantially cylindrical headers joined by a plurality of tubes, said tubes being received in a set of holes arranged in a circumferential band in the cylindrical wall of each header, at least some of said tubes being bent at their ends to enter the holes in the cylindrical walls, the headers at each end of the sections having a series of longitudinally disposed openings giving access to the tubes, closures therefor, two water compartments disposed adjacent opposite ends of a group of headers, and pipes connecting both end portions of the headers in said group to said water compartments.

7. In a heat transfer device, a plurality of sections arranged side by side, each section havingapairofsubstantiallycylindricalheaders joined by a plurality of tubes, said tubes being received in a set of holes arranged in a circumferential band in the cylindrical Wall of each header, at least some of said tubes being bent at their ends to enter the holes in the cylindrical Walls, the headers at each end of the sections having a series of longitudinally disposed openings giving access to the tubes, closures therefor, water compartments at both ends of the sections, and each common to the group of headers at each end of the sections, and pipes connecting the end portions of the headers in the respective groups to said Water compartments.

8. A heat transfer device comprising groups of headers disposed on opposite sides of a gas pass, the headers of both groups having substantially cylindrical Walls provided with sets of holes, each arranged in a transverse band of said Wall portion, a substantially continuous bank of tubes extending across said pass and having the tubes therein secured in said holes to connect the headers of opposite groups, at least some of said tubes being bent at at least one end to enter said holes, adjacent headers being spaced apart, a compartment common to each of said groups of headers, and pipes connecting the end portions of said headers to said compartment.

9. In a heat transfer device, a header having on one side thereof a curved Wall of greater thickness than is required for strength, and a nest of tubes entering holes in said Wall, the ends of the tubes being directed toward a handhole formed in the side of the header opposite the tubes, the metal of the Wall adjacent certain of said tube ends being cut away to provide counterbores substantially coaxial With the tube holes.

DAVID S. J ACOBUS. 

